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AS 970
Manual · 8.75‴ · Switzerland · 1935
Dimensions
19.7 mm
Height
3.45mm
Jewels
17
Power reserve
45h
Timegrapher
Beat rate
18,000bph
Frequency
2.5Hz
Lift angle
52°
Reference: healthy amplitude ≈ 270–315° fully wound (>200° at 24 h); beat error ideally < 0.5 ms.
Movement
| Movement type |
Manual
Purely mechanical movements wound by hand via the crown, which tensions the mainspring to store energy. As the spring unwinds, it drives the gear train at a controlled rate set by the escapement and balance. Typical power reserves range from 38 to 80 hours, requiring daily or near-daily winding to keep the watch running.
|
|---|---|
| Winding type |
Stem Winding (Crown)
Winding the mainspring by turning the crown attached to the stem, transmitting torque through the winding pinion. Patented by Adrien Philippe in 1842, it replaced key winding and remains the standard manual winding method for both pocket watches and wristwatches.
|
| Setting type |
Stem Set (Crown Pull)
The dominant modern system: pulling the crown out to a setting position engages the hand-setting mechanism. Introduced in the late 19th century and refined into multi-position crowns (date, time, GMT). Used in virtually all modern wristwatches and most 20th-century pocket watches.
|
| Escapement type |
Swiss Lever
The undisputed standard of modern mechanical watchmaking. Through an elegant interplay between escape wheel, pallet fork, and balance, it delivers reliable impulses with the safety of 'draw' to keep the lever locked. Refined since the 18th century, it powers almost every quality mechanical wristwatch made today.
|
| Control type |
Balance Wheel
The heart of mechanical timepieces, the balance wheel is an oscillating component that, together with the hairspring, forms a harmonic oscillator regulating the gear train's pace. Its steady back-and-forth motion ensures the even release of energy from the mainspring, governing the watch's accuracy.
|
| Regulator type |
Pinned Regulator (or Index Regulator)
The most traditional regulator, consisting of a movable index pointer fitted with two curb pins (or a pin and a boot) that embrace the hairspring. Sliding the index along its scale changes the spring's active length, adjusting the rate. Simple, reliable, and easy to service, it remains the workhorse standard across countless mechanical movements.
|
Specifications
| Lignes | 8.75‴ |
|---|---|
| Shape |
Round
It is the most common form that we can find.
|
| Complications |
Sub Second
A small seconds hand typically located on a sub-dial and is separate from the central hour and minute hands. Originating from early pocket watches where the main balance wheel drove the seconds hand, it offers an elegant way to track the passage of time without crowding the main display. It remains a testimony to the watch's mechanical precision and history.
,
Perpetual Calendar
An engineering masterpiece, it accounts for month variations and leap years. It's a testament to horological excellence, programmatically tracking the intricacies of the Gregorian calendar.
|
| Hand count | 3 |
| Hand sizes | 1.20 x 0.65 / 0.18mm |
| Further measures | Mounting Diameter (Dm): 19.4mm Stem height (T): 1.7mm Mounting Height (F): 0.5mm |
Origin & References
| Manufacturer | AS |
|---|---|
| Country | Switzerland |
| Launch year | 1935 |
| COSC certified | No |
| Signature | 1-2) ca. 1945: CON, Charlin Watch Co, Swiss, 7 Jewels - AS 970
3-4) ca. 1950: DYR, Den-Ro Import Corp., Swiss, 17 Jewels - KU |
Notes
Remarks: 1935-1967, <16.000.000
(all variants)
option: bimetallic screw balance
also without separate escape-wheel cock
The movements of this family were made with different balances, partially with the same, partially with different calibre designations. Catalogues differ regarding the differences, but these are small enough to interchange the parts.
differences not known between 970, 980, 987, 999, 1014, 1036, 1047, 1056, 1090, 1210, 1217, 1251, 1254, 1276, 1375, 1386
Attention, there are equally looking calibres with H= 3.0mm
Other data: balance staff: U536 stem: W138 mainspring / battery: Zf1298, 1.60 x 7.5 x 0.08 x 250mm balance staff ronda: 143 (8,75) balance staff ronda: 262 (8,75) balance staff ronda: 2851 (8,75) balance staff ronda: 292 (8,75) balance staff ronda: 3245 (8,75) stem ronda: 149 (8,75) Mainspring: 1.600 x 7.000 x 0.080 x 260.000 mm
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 7, 15, 17
(all variants)
option: bimetallic screw balance
also without separate escape-wheel cock
The movements of this family were made with different balances, partially with the same, partially with different calibre designations. Catalogues differ regarding the differences, but these are small enough to interchange the parts.
differences not known between 970, 980, 987, 999, 1014, 1036, 1047, 1056, 1090, 1210, 1217, 1251, 1254, 1276, 1375, 1386
Attention, there are equally looking calibres with H= 3.0mm
Other data: balance staff: U536 stem: W138 mainspring / battery: Zf1298, 1.60 x 7.5 x 0.08 x 250mm balance staff ronda: 143 (8,75) balance staff ronda: 262 (8,75) balance staff ronda: 2851 (8,75) balance staff ronda: 292 (8,75) balance staff ronda: 3245 (8,75) stem ronda: 149 (8,75) Mainspring: 1.600 x 7.000 x 0.080 x 260.000 mm
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 7, 15, 17
Family
Series 970 - 1828
18000 A/h, 1st balance, plate and bridges plane, :
970, 980, 987, 999, 1014, 1036, 1047, 1056, 1090, 1210, 1217, 1251, 1254, 1276, 1375, 1386: sub second
1003, 1018, 1126: sweep second
1359: sub second, date
18000 A/h, 2nd balance, edges bevelled:
970 III, 1354, 1376, 1556: sub second
1156: sub second, no mounting flange
1159: sweep second
21600 A/h, 2nd balance:
1726: sub second, plate and bridges plane
1727, 1828: sub second, edges bevelled
970, 980, 987, 999, 1014, 1036, 1047, 1056, 1090, 1210, 1217, 1251, 1254, 1276, 1375, 1386: sub second
1003, 1018, 1126: sweep second
1359: sub second, date
18000 A/h, 2nd balance, edges bevelled:
970 III, 1354, 1376, 1556: sub second
1156: sub second, no mounting flange
1159: sweep second
21600 A/h, 2nd balance:
1726: sub second, plate and bridges plane
1727, 1828: sub second, edges bevelled
Related calibers
AS 1003
AS 1014
AS 1018
AS 1036
AS 1047
AS 1056
AS 1090
AS 1126
AS 1156
AS 1159
AS 1210
AS 1217
AS 1251
AS 1254
AS 1276
AS 1354
AS 1359
AS 1375
AS 1376
AS 1386
AS 1556
AS 1726
AS 1727
AS 1828
AS 970
AS 970 III
AS 980
AS 987
AS 999
Compatible Parts
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